[RFI] Frequency-Specific Interference

[Hisashi T Fujinaka]

On Tue, 28 Feb 2012, KD7JYK DM09 wrote:

> : All this speculation is a huge waste of time and is irrelevant.
>
> Not really...  A bad ballast doesn't sound like an electric fence, which
> doesn't sound like loose hardware, which doesn't sound like RFI from a
> computer, which doesn't sound like noise from a switching mode power supply,
> which doesn't sound like the ECU in my truck, which doesn't sound like a
> Toyota Prius at a quarter mile, which doesn't sound like a motorcycle with
> magneto ignition three miles away, which doesn't sound like a noisy CFL in
> the shack, which doesn't sound like the galvanic ruckus from my stove when
> the flame is on, nor my watch, nor the massive hash generating cathodic
> protection systems covering our continent like a spiderweb...  You get the
> idea.  I don't waste my time looking for all these irrelevant things when
> the sound I hear sounds like a plasma TV or bad light bulb.  Most things can
> be eliminated just by the sound.

Also, loop antennas are pretty well known. It wouldn't be hard to create
a loop tuned at a specific frequency. Use it with a receiver and you can
have a very directional null.

-- 
Hisashi T Fujinaka - htodd at twofifty.com
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte